BoilerFaultCodesWorcester Bosch F0 238 Fault Code
Also written as F0238 — same fault.
The Worcester Bosch F0 238 fault code means: your boiler has detected an electrical communication problem with the internal gas control system, meaning it cannot safely light the flame to provide heating or hot water.. It appears on 11 Worcester Bosch models in our database.
Technical description: Gas valve or control box error – gas valve coils need checking
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the F0 238 fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £180-£350
- 26 CDi Xtra Repair: £180-350
- 30i Junior Repair: £180-450
- 35 RSF Repair: £180-350
- Danesmoor Repair: £180-£450
- Greenstar 12i System Repair: £250-450
- Greenstar i Repair: £250-450
- Heatslave Repair: £180-450
- Hideaway Repair: £180-350
- Junior 24i Repair: £180-£350
- Junior 28i Repair: £180-350
Source
Worcester Bosch F0 238 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026